Vibration dampener for fluid pressure gauges



Ma ,s, 1934. 1,957,894

I VIBRATION DAMPEENER FOR FLUID PRESSURE GAUGES c. LONGENECKER Filed Jar 1952 Chas. .lLolgeneckel;

Patent 373 1 1,957,894

VIBRATION DAIVIPENER FOR PRESSURE GAUGES Charles Longenecker, Wauwatosa, Wis., as-

signor to Chain Belt Company, Milwaukee, Wis., a corporation of Wisconsin Application January 6, 1932', Serial No. 585,141

souims. (01. 137-11) lhis invention relates to vibration dampeners 'tion and combinations or parts more fully herefor fluid pressure gauges and the like and has for inafter described and particularly pointed out in one of its objects to provide a device oi this charthe appended claims. acter which will be simple in construction, com- Referring to the accompanying drawing form- 6 paratively inexpensive to manufacture and more ing a part of this specification in which like ref- 60 eificient in use than those which have been hereerence characters designate like parts in all the to'fore proposed. views:-- v

In the indicating or recording of fluid pressures Figure 1 is a diagrammatic side elevational by the usual type of pressure gauge, the gauge view, partly in section, oi! a portion of a pressure needle or other indicating element is frequently producing pump with a vibration dampener con- 65 subject to comparatively wide and rapid structed in accordance withthe present invenfiuctuations where corresponding variations oc tion shown in communication with the discharge our in the pressure of the fluid which is being passage of the said pump; measured. Such rapid fluctuations in the pres- Figure 2 is an enlarged longitudinal vertical sure are destructive to the delicate mechanism sectional view through the dampener shown in 70 of the gauge, and as a result the indications of Figure 1; and

v the gauge become unreliable in a comparatively Figure 3 is an end elevational view of the parts short time and in many instances the instrument shown in Figure 2, as seen from the right 01 the must be replaced. said figure.

In one form of portable triplex piston pump While the dampener comprisingthe present in- '15 developed for use in connection with concrete vention is of course susceptible of use with a road work, which demands an unfailing supwide variety of pumps and other pressure proply of water, often far from municipal mains, a duclng apparatus, for the purpose of illustration comparatively small quantity of water-80 to it has been here shown as attached to a mul- 125 gallons per minute-is delivered. at prestiple cylinder reciprocating water pump of the sures up to as high as 500 lbs. per sq. in. The type disclosed'and claimed in my prior Patent pump normally operates at from 80 to 100 No. 1,751,413, dated March 18, 1930. Such a R. P. M., thus givingan aggregate of from 240 pump comprises a framework 5 upon which is to 300 strokes per minute of its three pistons, mounted a water box or working chamber 6 30 with an equal number of pressure variations having an inlet conduit 7 and a discharge pas which may range up to 40 lbs. per sq. in. or more. sage 8. A plurality of reciprocating pistons or Further, the pressure line from the pump is not plungers 9 work up and down in the chambers of ordinarily provided with a. reservoir or water the water box 6 to force fluid therein'through a storage arrangement, with the result that if a valve chamber or housing 10 and into the dis- 35 valve be opened, the pressure drops almost incharge passage 8, all as is disclosed in my said '90 stantaneously from say 500 lbs. per sq. in. to less prior patent. than 100 lbs. per sq. in. The continuous pulsa- The dampener comprising the present inventions resulting from the reciprocations of the tion, which may be screwed into or otherwise conpump pistons, as well as the wide variations 06- nected with the discharge passage 8, comprises a 4,0 casioned by the opening and closing of valves in body member 11 of substantially T-shape in lonthe discharge line rapidly fatigue the metal of gitudinal section, one end of which is threaded as the gauge tube to the breaking point, and pro at 12 for connection with the discharge passage duce excessive wear upon the bearings and other or conduit which is conveying the fluid, the presdelicate parts of the instrument, with the result, sure or which is to be measured. The said mem- 45 that the gauge soon becomes useless. bar is provided with a pair of intersecting bores The primary object of the present invention is 13'and 14, here shown as arranged at substanto provide a simple and effective device for abtially right angles to one another, with the bore sorbing and smoothing out the pressure variations 13 discharging at one end into the bore 14 whereby the indications of the gauge indicator through a port 15. The opposite end of the bore 50 may be substantially constant, and the wear and 13 is provided with a choke plug 16 threaded tear upon the delicate gauge mechanism may be into the body member substantially as shown in materially reduced. Figure 2 and provided with a restricted-pas- With the above and other objects in view which sage 17 which controls the flow of fluid through will appear as the description proceeds the inthe bore 13 and into the bore 14.

5 vention consists in the novel, details of construc- The bore 14 which is preferably, although not necessarily larger in diameter than the bore 13 to constitute a dampening chamber 18, is thread- I ed at one end as at 19 to receive the connection member 20 by means of which the gauge 21 is attached to the dampener. The said connection 20 is also provided with a choke plug 22 having a restricted passage 23 which aifords communication between the chamber 18 and the working parts of the gauge 21 as will be readily understood.

The opposite end of the bore 14 is covered by a yieldable member 24'here indicated as comprising a laminated rubber or other similar flexible diaphragm which is removably clamped in position across the said bore by a retaining member 25 which is secured to the body member 11 by suitable bolts 26. The said body member is also provided with a drain opening 27 which is or may be substantially opposite to the port 15 of bore 13 and which opening is normally closed by a plug 28 as will be clear from the drawings. The retaining member 25 is provided with an aperture 29 in alinement with bore 14-, so that the diaphragm 24 is open to the atmosphere on one side.

In use the dampener is screwed into the discharge passage such as 8 of the pump or into any other suitable portion of the conduit carrying the fluid whose pressure is to be measured, so that said fluid may enter the chamber 18 through the restricted passage 1'7 of the choke 16 and bore 13, from which chamber it may pass through the restricted passage 23 of choke 22 to the operating mechanism of the gauge. Any increase in the normal pressure of the'fluid will cause a yielding of the resilient diaphragm 24 which will have the effect of reducing the excess pressure upon the operating mechanism of the gauge, with the result that fluctuations in the indications of the gauge needle will be material reduced. Obviously wear and tear upon the operating mechanism of the gauge due to rapid fluctuation in the fluid pressure will likewise be reduced. The chokeplugs 16 and 22 have been found to also materially aid in the reduction of fluctuations of the gauge needle.

While one form of the invention has been illustrated and described; it is obvious that those skilled in the art may vary the details of construction as well as the precise arrangement of parts without departing from the spirit of the invention, and therefore it is not wished to be limited to the above disclosure except as may be required by the claims.

What I claim is:

1. A vibration dampener for fluid pressure gauges and the like comprising a body member provided with a pair of intersecting bores, one of which is adapted to feed fluid to the other, one end of said other bore being formed to receive a gauge connection; and a flexible diaphragm secured over the other end of said last named bore, whereby it is subject to and yieldable under variations in the fluid pressure within said bore to reduce fluctuations of the gauge indicator.

2. A vibration dampener for fluid pressure gauges, comprising a body member provided with a pair of intersecting bores, one of which is arranged to feed fluid to the other, one end of said other bore being formed to receive a gauge connection; a flexible imperforate diaphragm over the other end of said last named bore, whereby it is subject to and yieldable under variations in the fluid pressure within said bore to reduce fluctuations of the gauge indicator; and a retaining member secured to said body member for maintaining said diaphragm in operative position, said member having an aperture alined with said last named bore whereby one side of said diaphragm is open to the atmosphere.

3. A vibration dampener for fluid pressure gauges and the like, comprising a body having a fluid-feeding bore, and a second bore constituting a dampening chamber, disposed at an angle to and communicating with said first bore to receive fluid therefrom, said second bore being pro vided with a gauge connection; and a resilient diaphragm closing said second bore, having one side thereof subject to atmospheric pressure, said diaphragm being subject to and yieldable under variations in the fluid pressure within said bore to reduce fluctuations of the gauge indicator.

CHARLES I. LONGENECKER. 

